Meghan Markle shared a revelation earlier this month, when she revealed her last name is actually “Sussex” following her marriage to Prince Harry.

But Traitors’ contestant Lord Ivar Mountbatten, who is the second cousin of King Charles, is insisting she’s wrong.

Mountbatten, 61, was asked about his thoughts on the Suits alum’s rebrand by Town & Country on Friday, March 7, and he shared why he thought the “Sussex” surname didn’t make sense.

“It’s interesting because she’s completely incorrect. Her family name is not Sussex, her family name is Mountbatten-Windsor,” he explained to the outlet. “Her children are called Archie and Lilibet Mountbatten-Windsor; they’re not called Archie and Lilibet Sussex because Sussex is a title.”

Related: Why Meghan Markle, Prince Harry and Kids Use 2 Last Names

Is it Meghan Markle, Meghan Sussex — or something else entirely? Meghan, the Duchess of Sussex, clarified her last name during a conversation with Mindy Kaling in her new Netflix docuseries, With Love, Meghan. In the lifestyle show, which premiered on Tuesday, March 4, Meghan corrected Kaling after she referred to the duchess by her […]

He continued: “So, they are the Duke and Duchess of Sussex, but actually he’s Harry Mountbatten-Windsor and she would be Meghan Mountbatten-Windsor. My brother is the Marquess of Milford Haven, but his surname is Mountbatten, so he’s called George Mountbatten, the Marquess of Milford Haven. When I read that, it was an article about her new program [Netflix’s With Love, Meghan], and she said that her family name is Sussex.”

During the interview, Mountbatten also admitted that he hadn’t yet had a chance to see Meghan’s Netflix offering for himself.

“No, I haven’t [watched it],” he said. “I might be interested to watch it; it might not last long.”

Lord Ivar Mountbatten Thinks Meghan Markle is Wrong About Sussex Surname

Meghan Markle and Prince Harry.
(Photo by Eric Charbonneau/Archewell Foundation via Getty Images)

In With Love, Meghan, the former actress said her last name is now “Sussex” after Mindy Kaling referred to her as “Meghan Markle.”

“It’s so funny you keep saying Markle,” Meghan, 43, said. “You know it’s Sussex now. You have kids and you go, I share my name with my children. I didn’t know how meaningful it would be to me, but it just means so much to go, this is our family name. Our little family now.”

Prince William, Prince Harry, Meghan Markle, and Princess Kate Middleton

Related: Where Meghan and Royals Get Their Last Names From

The name Meghan Markle has officially been retired. Meghan, the Duchess of Sussex, 43, spoke to Mindy Kaling about why she prefers the last name Sussex in her new Netflix docuseries, With Love, Meghan. “It’s so funny you keep saying Markle,” Meghan said. “You know it’s Sussex now. You have kids and you go, I […]

In response, Kaling, 45, said, “Now I know and I love it.”

Meghan and husband Prince Harry were given the Sussex name by Queen Elizabeth II on their 2018 wedding day, a moniker she called “part of our love story.” (Meghan and Harry, 40, welcomed son Archie in 2019 and daughter Lilibet in 2021.)

Speaking to People in an interview published on Monday, March 3, Meghan further explained why the “Sussex” last name was so important to her.

“It’s our shared name as a family, and I guess I hadn’t recognized how meaningful that would be to me until we had children,” she told the outlet. “I love that that is something that Archie, Lili, H and I all have together. It means a lot to me.”

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